/*
 * Copyright 2014-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.websocket.demo.websocket;

import java.util.Collections;


import org.springframework.context.ApplicationListener;
import org.springframework.messaging.simp.SimpMessageSendingOperations;
import org.springframework.web.socket.messaging.SessionDisconnectEvent;

public class WebSocketDisconnectHandler<S> implements ApplicationListener<SessionDisconnectEvent> {


    private SimpMessageSendingOperations messagingTemplate;

    public WebSocketDisconnectHandler(SimpMessageSendingOperations messagingTemplate) {
        super();
        this.messagingTemplate = messagingTemplate;

    }

    @Override
    public void onApplicationEvent(SessionDisconnectEvent event) {
        String id = event.getSessionId();
        if (id == null) {
            return;
        }
        this.messagingTemplate.convertAndSend("/topic/friends/signout",
                Collections.singletonList("乌拉"));
    }

}
